Inventories - Components of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015
Inventory [Line Items]
Raw materials	$ 7,351	$ 7,095
Work-in-process	12,297	10,096
Total	38,778	35,817
Illumigene Instruments [Member]
Inventory [Line Items]
Finished goods	2,260	1,890
Kits and Reagents [Member]
Inventory [Line Items]
Finished goods	$ 16,870	$ 16,736